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Routing a design using route/zrt in IC Compiler

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dw_man

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I am routing a design in IC Compiler. From what I understand, ZRoute is a newer faster method of routing a design.

If I use this method route_zrt_auto, is it then possible to do optimizations using the route_opt command if I use the -skip_initial_routing switch? I am just slightly confused as to whether they can be used together as there doesn't seem to be any command to optimise ZRoute.

If I just use the regular routing method, and then verify_route, I seem to get much different results than if I use the zrt method followed by verify_zrt_route. Is this normal and what is the reasoning for this?
 

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